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arm: kvm: implement CPU PM notifier

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Upon CPU shutdown and consequent warm-reboot, the hypervisor CPU state
must be re-initialized. This patch implements a CPU PM notifier that
upon warm-boot calls a KVM hook to reinitialize properly the hypervisor
state so that the CPU can be safely resumed.

Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
This commit is contained in:
Lorenzo Pieralisi 2013-08-05 15:04:46 +01:00
parent fb1ab1ab38
commit 1fcf7ce0c6
1 changed files with 30 additions and 0 deletions
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30
arch/arm/kvm/arm.c
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@ -17,6 +17,7 @@
*/ */
#include <linux/cpu.h> #include <linux/cpu.h>
#include <linux/cpu_pm.h>
#include <linux/errno.h> #include <linux/errno.h>
#include <linux/err.h> #include <linux/err.h>
#include <linux/kvm_host.h> #include <linux/kvm_host.h>
@ -853,6 +854,33 @@ static struct notifier_block hyp_init_cpu_nb = {
.notifier_call = hyp_init_cpu_notify, .notifier_call = hyp_init_cpu_notify,
}; };
#ifdef CONFIG_CPU_PM
static int hyp_init_cpu_pm_notifier(struct notifier_block *self,
unsigned long cmd,
void *v)
{
if (cmd == CPU_PM_EXIT) {
cpu_init_hyp_mode(NULL);
return NOTIFY_OK;
}
return NOTIFY_DONE;
}
static struct notifier_block hyp_init_cpu_pm_nb = {
.notifier_call = hyp_init_cpu_pm_notifier,
};
static void __init hyp_cpu_pm_init(void)
{
cpu_pm_register_notifier(&hyp_init_cpu_pm_nb);
}
#else
static inline void hyp_cpu_pm_init(void)
{
}
#endif
/** /**
* Inits Hyp-mode on all online CPUs * Inits Hyp-mode on all online CPUs
*/ */
@ -1013,6 +1041,8 @@ int kvm_arch_init(void *opaque)
goto out_err; goto out_err;
} }
hyp_cpu_pm_init();
kvm_coproc_table_init(); kvm_coproc_table_init();
return 0; return 0;
out_err: out_err: